INVESTIGADORES
PIZARRO Haydee Norma
artículos
Título:
Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants.
Autor/es:
P. RODRÍGUEZ; H. PIZARRO; VERA, M.S.
Revista:
HYDROBIOLOGIA
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 p. 285 - 298
ISSN:
0018-8158
Resumen:
Abstract We conducted a 1-year survey in two
humic shallow lakes from the floodplain of the Lower
Parana´ River, Laguna Grande Lake (LGL) and a
relictual oxbow lake (ROL). We aimed to test two
hypotheses: (1) the efficiency in light use of picoplankton
(0.23 lm) is greater as light restriction
increases and (2) the contribution of picoplankton to
the total productivity is higher when the total photosynthetic
biomass is lower.We performed PE curves
for picoplankton and nano- and microplankton
([3 lm) using the 14C assimilation technique. The
light environments of the water bodies differed mainly
owing to the development of free floating plants on the
surface of the ROL and the dominance of phytoplankton
in LGL. Primary productivity patterns in LGL
were seasonality driven whilst in the ROL they were
related to the coverage of floating macrophytes, which
promoted light limitation and a lower productivity. In
LGL, nano- and microplankton were in general more
productive and the relative contribution of picoplankton
to the total phytoplankton production decreased
with the increase in total photosynthetic biomass.
Hence, our study extends previously observed patterns
to subtropical shallow lakes, where seasonality and
free floating plants may influence the dynamics of
phytoplankton production